The North Fork American River is the longest branch of the American River in Northern California.
It is 88 miles (142 km) long from its source at the crest of the Sierra Nevada, near Lake Tahoe, to its mouth at Folsom Lake northeast of Sacramento.
Prior to the construction of Folsom Dam the river was about 9 miles (14 km) longer making for a total length of 97 miles (156 km).
